The Type-51 Directed Energy Rifle/Improved (T51 DER/I), more commonly known as a Plasma Repeater, is a plasma-based Directed Energy Weapon used by what used to be the Covenant Empire, specifically the Sangheili and Jiralhanae, during the Fall of Reach in August 2552. The weapon also saw action in the post-war years in the hands of the Covenant Remnant.

Description

The weapon's rate of fire will slow as it is fired and the weapon heats up. This can be solved by manually venting the rifle with the reload button, which can be done all at once or gradually. However, as the weapon overheats and the rate of fire slows, the accuracy of the weapon will increase.

It is very likely that the Type-51 DER is either new to the Covenant arsenal or it is a branch-specific weapon, as it has only been encountered by the UNSC very recently and only in very limited numbers.